@echo off
SET user_name=vasya
SET pass=
SET host=111.111.11.11
SET port=3306
SET db_name=somedb_1_1
SET dump_file=dump_%db_name%_%DATE:~6,4%%DATE:~3,2%%DATE:~0,2%.sql 

mysqldump -u %user_name% -p%pass% -h %host% -P %port% --databases --add-drop-database %db_name%  > %dump_file%
pause